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cgroup, sched: Move basic cpu stats from cgroup.stat to cpu.stat

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The basic cpu stat is currently shown with "cpu." prefix in
cgroup.stat, and the same information is duplicated in cpu.stat when
cpu controller is enabled.  This is ugly and not very scalable as we
want to expand the coverage of stat information which is always
available.

This patch makes cgroup core always create "cpu.stat" file and show
the basic cpu stat there and calls the cpu controller to show the
extra stats when enabled.  This ensures that the same information
isn't presented in multiple places and makes future expansion of basic
stats easier.

Signed-off-by: Tejun Heo <tj@kernel.org>
Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
This commit is contained in:
Tejun Heo
2017-10-23 16:18:27 -07:00
parent 0d5936344f
commit d41bf8c9de
7 changed files with 75 additions and 28 deletions
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kernel/cgroup/stat.c
+5 -5
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@@ -256,7 +256,7 @@ void __cgroup_account_cputime_field(struct cgroup *cgrp,
cgroup_cpu_stat_account_end(cgrp, cstat);
}
void cgroup_stat_show_cputime(struct seq_file *seq, const char *prefix)
void cgroup_stat_show_cputime(struct seq_file *seq)
{
struct cgroup *cgrp = seq_css(seq)->cgroup;
u64 usage, utime, stime;
@@ -278,10 +278,10 @@ void cgroup_stat_show_cputime(struct seq_file *seq, const char *prefix)
do_div(utime, NSEC_PER_USEC);
do_div(stime, NSEC_PER_USEC);
seq_printf(seq, "%susage_usec %llu\n"
"%suser_usec %llu\n"
"%ssystem_usec %llu\n",
prefix, usage, prefix, utime, prefix, stime);
seq_printf(seq, "usage_usec %llu\n"
"user_usec %llu\n"
"system_usec %llu\n",
usage, utime, stime);
}
int cgroup_stat_init(struct cgroup *cgrp)